Creep meters: measures the movement along a strike slip fault Laser ranging devices: device that measures changes with a laser beam and a reflector Tiltmeters: measures tilting of the ground, works like a carpenter's level Satellite moniter: uses radar to take picture of faults
Outline
Device that Monitor Faults
there are four different types of instruments
creep meters
a creep meter uses a wire stretched across a fault to measure horizontal movement of the ground
on one side of the ground, the wire is tied to the pole
on the other side of the ground, the wire is attached to a weight that can slide if the fault moves
geologists can measure how much the fault has moved because of the weight
laser-ranging devices
this device uses a laser beam to find tiny fault movements
this device can find any change in the distance to the reflector
tiltmeters
this instrument measures tilting of the ground
seismologists use this to consist of two bulbs that are filled with liquid and connected to a hollow stem
if the land rises, the liquid will go from one bulb to the other bulb
each bulb has a scale to measure the depth of the liquid
geologists read the scales to measure how much the fault has moved
satellite monitors
the satellite bounces radio waves off the ground
as the waves echo back into space, the satellite records them
the distance from the ground to the satellite changes, depends when the ground moves
these changes in elevation result when stress deforms the ground along the fault
Table of Contents
2.4 Monitoring Faults
Vocabulary
Creep meters: measures the movement along a strike slip fault
Laser ranging devices: device that measures changes with a laser beam and a reflector
Tiltmeters: measures tilting of the ground, works like a carpenter's level
Satellite moniter: uses radar to take picture of faults
Outline
Device that Monitor Faults
Monitoring Risks in the United States
Diagram